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So a 2,000-square-foot crawl space would need a 40 cfm exhaust fan. It's pulling just a little bit of air from the crawl space. The problem is that you don't really know where the makeup air for the crawl space is coming from. Yes, the code specifies a pathway for air to move into the crawl space from the house, but air doesn't always follow those arrows in the diagrams.
We now know that installing foundation vents to air out your crawl space actually creates even more moisture problems. An Advanced Energy study found that crawl spaces with open foundation vents stay above 70% relative humidity â well above the healthy humidity level of 50%.e now know that installing foundation vents to air out your crawl space actually creates even more moisture problems. An Advanced Energy study found that crawl spaces with open foundation vents stay above 70% relative humidity â well above the healthy humidity level of 50%.